package cn.edu.fjnu.camera;

import java.io.IOException;

import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View.MeasureSpec;

public class CameraPreview extends SurfaceView {
	private float mAspectRatio;
    private int mHorizontalTileSize = 1;
    private int mVerticalTileSize = 1;
    public static float DONT_CARE = 0.0f;
	
	private static final String TAG = "CameraPreview";
	
	//SurfaceHolder mHolder;
	//Camera mCamera;
	
	public CameraPreview(Context context)
	{
		super(context);		
		
	}
	public CameraPreview(Context context, AttributeSet attrs)
	{//���캯���ø�SurfaceView��SurfaceHolder��������Holder�����ͣ������ļ�ʵ���
	 //SurfaceView�����ʱ����øù��캯��
		super(context, attrs);
//		mHolder = getHolder();		
//		mHolder.addCallback(this);
//		mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
	}
	
	public CameraPreview(Context context, AttributeSet attrs, int defStyle)
	{
		super(context, attrs, defStyle);
	}
	
	
	
	public void setTileSize(int horizontalTileSize, int verticalTileSize) {
        if ((mHorizontalTileSize != horizontalTileSize)
                || (mVerticalTileSize != verticalTileSize)) {
            mHorizontalTileSize = horizontalTileSize;
            mVerticalTileSize = verticalTileSize;
            requestLayout();
            invalidate();
        }
    }
	public void setAspectRatio(int width, int height) {
        setAspectRatio(((float) width) / ((float) height));
    }
	
	public void setAspectRatio(float aspectRatio) {
        if (mAspectRatio != aspectRatio) {
            mAspectRatio = aspectRatio;
            requestLayout();
            invalidate();
        }
    }
	
	@Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (mAspectRatio != DONT_CARE) {
            int widthSpecSize =  MeasureSpec.getSize(widthMeasureSpec);
            int heightSpecSize =  MeasureSpec.getSize(heightMeasureSpec);

            int width = widthSpecSize;
            int height = heightSpecSize;

            if (width > 0 && height > 0) {
                float defaultRatio = ((float) width) / ((float) height);
                if (defaultRatio < mAspectRatio) {
                    // Need to reduce height
                    height = (int) (width / mAspectRatio);
                } else if (defaultRatio > mAspectRatio) {
                    width = (int) (height * mAspectRatio);
                }
                width = roundUpToTile(width, mHorizontalTileSize, widthSpecSize);
                height = roundUpToTile(height, mVerticalTileSize, heightSpecSize);
                Log.i("VideoPreview", "ar " + mAspectRatio + " setting size: " + width + 'x' + height);
                setMeasuredDimension(width, height);
                return;
            }
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
	
	 private int roundUpToTile(int dimension, int tileSize, int maxDimension) {
	        return Math.min(((dimension + tileSize - 1) / tileSize) * tileSize, maxDimension);
	    }
}
